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545 vs 555 16 of 19 identical Swap Change panels

GCL GCL-M10/72GDF-B-545 vs GCL GCL-M10/72GDF-B-555

GCL-M10/72GDF-B-545
545 Wp 20.80 % PERC Bifacial
Open panel page Datasheet PDF
VS
GCL-M10/72GDF-B-555
555 Wp 21.10 % PERC Bifacial
Open panel page Datasheet PDF
The verdict

555 leads on the differences that matter

The largest is module efficiency: 0.30 pp more efficient. 16 of 19 comparable parameters are identical.

See all 3 differences
How alike are they
16 of 19 comparable
parameters are identical
identical differs
01

What actually differs

3 of 19 parameters
Parameter 545 555 Difference
Module efficiency 20.80 % 21.10 % 0.30 pp more efficient
Power density 207.7 Wp/m² 211.5 Wp/m² 3.8 Wp/m² higher
Rated power 545 Wp 555 Wp 10 W more power
02

What it means on a roof

Thirty years of production
Each panel's own declared degradation curve, at 1,200 kWh/kWp a year
Same temp coeff. for both panels (-0.350 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
545
17,947 kWh
555
18,277 kWh
Lifetime gap
330 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 545 555
Standard test conditions 25 °C 100.0% of rated power 545 W 555 W
Cool, bright day 40 °C 94.8% of rated power 516 W 526 W
Typical summer roof 55 °C 89.5% of rated power 488 W 497 W
Hot roof 70 °C 84.2% of rated power 459 W 468 W
03

Full specification

Parameter 545 555 Difference
Power and efficiency
Rated power 545 Wp 555 Wp +10 W for 555
Module efficiency 20.80 % 21.10 % +0.30 pp for 555
Power density 207.7 Wp/m² 211.5 Wp/m² +3.8 Wp/m² for 555
Open-circuit voltage 49.52 V 50.08 V Effectively the same
Voltage at max power 41.70 V 42.18 V Effectively the same
Short-circuit current 13.83 A 13.93 A Effectively the same
Current at max power 13.07 A 13.16 A Effectively the same
Temperature
Temperature coefficient -0.350 %/°C -0.350 %/°C Same
Mechanical
Dimensions 2290x1146x30 mm 2290x1146x30 mm Same
Module area 2.624 m² 2.624 m² Same
Weight 33.2 kg 33.2 kg Same
Weight per kWp 60.9 kg/kWp 59.8 kg/kWp Effectively the same
Warranty and degradation
Product warranty 12 yrs 12 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.45 %/yr 0.45 %/yr Same
Technology
Cell technology PERC PERC Same
Cell type Monocrystalline Monocrystalline Same
Cell count 144 144 Same
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#10,457 vs #9,297
555 leads by 1,160 places
Power density
#10,552 vs #9,200
555 leads by 1,352 places
Heat behaviour
#10,419 vs #10,419
Tied - the same position in the database
Weight
#12,552 vs #12,297
555 leads by 255 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#7,858 vs #7,100
555 leads by 758 places
05

More useful comparisons

Open the full database
Same series, other bin
GCL GCL-M10/72GDF-B-545 vs GCL GCL-M10/72GDF-B-550
One difference: module efficiency
Same series, other bin
GCL GCL-M10/72GDF-B-545 vs GCL GCL-M10/72GDF-B-540
One difference: module efficiency
Same series, other bin
GCL GCL-M10/72GDF-B-545 vs GCL GCL-M10/72GDF-B-535
3 differences, the largest is module efficiency
Same manufacturer
GCL GCL-M10/72GDF-B-545 vs GCL GCL-NT12/66GDF-740
13 differences, the largest is module efficiency
Same manufacturer
GCL GCL-M10/72GDF-B-545 vs GCL GCL-NT12/66GDF-735
13 differences, the largest is module efficiency
Same manufacturer
GCL GCL-M10/72GDF-B-545 vs GCL GCL-NT12/66GDF-730
13 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: GCL GCL-M10/72GDF-B-545 or GCL GCL-M10/72GDF-B-555?
According to our database: GCL GCL-M10/72GDF-B-555 has higher module efficiency (21.10% vs 20.80%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of GCL GCL-M10/72GDF-B-545 and GCL GCL-M10/72GDF-B-555?
GCL GCL-M10/72GDF-B-545 has a module efficiency of 20.80%, while GCL GCL-M10/72GDF-B-555 is 21.10%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does GCL GCL-M10/72GDF-B-545 use vs GCL GCL-M10/72GDF-B-555?
GCL GCL-M10/72GDF-B-545 uses PERC cells; GCL GCL-M10/72GDF-B-555 uses PERC. Modern n-type technologies (TOPCon, HJT, BC) typically deliver higher efficiency and lower degradation compared to older PERC (p-type) cells.
What is the warranty on GCL GCL-M10/72GDF-B-545 and GCL GCL-M10/72GDF-B-555?
GCL GCL-M10/72GDF-B-545 has a 30 years power warranty; GCL GCL-M10/72GDF-B-555 has a 30 years power warranty. The power warranty guarantees a minimum percentage of rated output at the end of the warranty period (typically 80-87%). Product (materials) warranties are usually shorter.
Are GCL GCL-M10/72GDF-B-545 and GCL GCL-M10/72GDF-B-555 bifacial panels?
Both GCL GCL-M10/72GDF-B-545 and GCL GCL-M10/72GDF-B-555 are bifacial - they capture reflected light from the ground, which can add 5-15% more annual energy on ground-mount or elevated rooftop installations with a light surface beneath.

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Every figure here is from the manufacturers' own datasheets - a dash means the value is not published, never an estimate. The thirty-year projection and the temperature scenarios are calculations from those figures, and each states its assumption above.